What should come in place of the question mark(?) in this question?

(8)² % of ? = 723 + 45

What should come in place of the question mark(?) in this question?

? % of 590 - 11.8 = 236

What should come in place of the question mark(?) in this question?

144  ÷ 8  ÷ ? = 9

What should come in place of the question mark(?) in this question?

3/4 of 26% of 850 = ?

What should come in place of the question mark(?) in this question?

672 ÷ 24 X 18 + 153 - 345 = ?

What should come in place of the question mark(?) in this question?

√1521 ÷ 3 X 12 = ?